Automobile charging circuit

Abstract

The invention discloses an automobile charging circuit which comprises a mains supply plug, an input rectification filter circuit, a high-frequency conversion circuit, a high-frequency transformer, asecondary rectification filter circuit and a charging joint which are connected in sequence, wherein the high-frequency conversion circuit is a high-frequency switch circuit; an LLCC filtering circuitis connected between the output end of the high-frequency switch circuit and the input end of the high-frequency transformer in series. The LLCC filtering circuit comprises a series inductor connected in series with an output end of the high-frequency switch circuit, a series capacitor connected with a series-connection inductor in series, a parallel inductor connected to the output end of the series connection capacitor and the other output end of the high-frequency switch circuit in parallel, and a parallel capacitor connected with the parallel inductor in parallel. According to the automobile charging circuit, high-frequency switching is achieved through the high-frequency switch circuit, and harmonic waves are effectively eliminated through the LLCC filtering circuit. The zero-voltageswitching-on of high-frequency switch circuit the stability of the subsequent power supply waveform can be ensured. Since a non-consuming discharge circuit is designed, the polarization phenomenon can be eliminated.

Description

technical field [0001] The invention relates to a charging circuit, in particular to an automobile charging circuit, and belongs to the technical field of charging circuits. Background technique [0002] During the use of the car, it is often necessary to charge the battery. For electric vehicles, the battery is its power source. Car charging needs to ensure a good safety environment. Since the neutral line of the mains is occasionally connected to the ground, the traditional charging method There are potential safety hazards. At the same time, commonly used charging methods such as constant voltage and current limiting charging, constant current and limiting voltage charging, constant current and constant voltage charging, pulse current charging, positive and negative pulse charging, etc.; Electric vehicles can be charged in a short time, and the need for continued use hinders the popularization and use of electric vehicles to a certain extent; for this reason, Chinese pate...

AI Technical Summary

Problems solved by technology

[0002] During the use of the car, it is often necessary to charge the battery. For electric vehicles, the battery is its power source. Car charging needs to ensure a good safety environment. Since the neutral line of the mains is occasionally connected to the ground, the traditional charging method There are potential safety hazards. At the same time, commonly used charging methods such as constant voltage and current limiting charging, constant current and limiting voltage charging, constant current and constant voltage charging, pulse current charging, positive and negative pulse charging, etc.; Electric vehicles can be charged in a short time, and the need for continued use has hindered the promotion and use of electric vehicles to a certain extent; for this reason, Chinese patent application number: 201721420250.6 discloses a charging circuit for electric vehicles

It includes a first AC / DC rectifier bridge, a DC / AC converter, a high-frequency transformer, a second AC / DC rectifier bridge, and a discharge circuit; the input end of the first AC / DC rectifier bridge is connected to the input power supply, and the output end is connected to the The input terminal of the DC / AC converter is connected; the output terminal of the half-bridge DC / AC converter is connected with the primary terminal of the high-frequency transformer; the secondary terminal of the high-frequency transformer is connected with the input terminal of the second AC / DC rectifier bridge connected; the output end of the second AC / DC rectifier bridge is connected to the input end of the discharge circuit, and the output end of the discharge circuit is connected to both ends of the battery of the electric vehicle; the charging circuit connects the mains power to the power supply system of the electric vehicle It is isolated, and the method of positive and negative pulse charging is adopted at the same time to realize the large current pulse discharge function and achieve the purpose of safe and fast charging; however, during the conversion process of the DC / AC converter, the waveform is prone to have harmonics. Polarization cannot be removed well

Images